LinkedIn 6x6 Sudoku #239 Pro-Tips Speed-Run
Related Puzzle
Mini Sudoku #239 - 1s First?
LinkedIn Sudoku #239 (1s First?) for April 7, 2026 full solution with question numbers and solutions.
LinkedIn 6x6 Sudoku #239: Speed-Run Pro-Tips
Grid hits you with a banded opener: top row locked 2-3-4-5, bottom echoes 4-5-6-3. Columns frame the fight early. This 6x6 demands precision scans over brute force. Here's your tactical blueprint, straight from the solve.
Launch with Cross-Hatching: Box 1 Ownage
Start in box 1 (top-left 2x3). Hunt for 6. Row 1 blocks it everywhere but column 1. Column 6 empty? Nah, row 2's 6 in column 6 kills options. Cross-hatch: slash rows/columns with 6s. Only cell (1,1) survives in box 1. Pencil that 6. Boom, first placement.
Chain it: now row 1 full (6,2,3,4,5,1). Cross-hatch 1 next. Box 2 (top-middle) pins 1 to row 2, column 6 empty spot. Fill row 2 column 6 with 1? Wait, scan deeper.
Hidden Singles Emerge: Row 5 Momentum
Post-6 fills, row 5 screams opportunity. Givens: 3 (col1), blanks, 5 (col6). For 6 in row 5: column 2 open, but box 4 constraints (row 4's 3, row 6's 4) leave one spot: row 5, column 2. Hidden single: 6 owns that cell in row 5, no rivals.
Why hidden? Other candidates crowd column 2, but row 5 forces 6 there. Fill it. Row 5 now breathes: scan for 2 next, box 4 cross-hatch drops it in column 3. Chain fills row 5 clean.
Crucial Square: Row 3, Column 2 - The Crack
Grid stalls mid-solve? Row 3, column 2 is your Crucial Square. Post-initial fills (rows 1-2 shaping up), cross-hatch 3 in row 3. Box 2 givens block elsewhere; column 2 scans eliminate all but this cell. Hidden single for 3: only row 3 spot survives box/column hits.
Place 3 there. Difficult Row 3 cracks wide: unlocks column 2 chain (5 above, 1 below), triggers box 3 6 in column 3, then naked singles cascade. From here, it's speed-run city: twins in box 5, eliminations fill the rest.
6x6 Tweaks for Lightning Solves
- Box-First Cross-Hatch: 2x3 blocks tighten faster than 9x9. Prioritize boxes with 4+ givens.
- Hidden Single Hunt: After each fill, rescan that unit only. Row 3 post-3 placement reveals immediate 6/4/5.
- Banded Grids Exploit: This puzzle's row bands (1-2-3, 4-5-6) mean vertical cross-hatches pay double. Column 6 mirrors the break.
- Post-Crack Acceleration: Once row 3 falls, pencilmarks vanish. Trust the cascade, no backtrack.
Sub-90 seconds possible clean. Replay #239: hit row 3 col 2, feel the grid surrender. Next one waits.